/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *  
 *     http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.kylin.cube.gridtable;

import org.apache.kylin.common.util.ByteArray;
import org.apache.kylin.common.util.ImmutableBitSet;
import org.apache.kylin.gridtable.GTRecord;

public class RecordComparator extends ComparatorEx<GTRecord> {
    final public ComparatorEx<ByteArray> comparator;

    RecordComparator(ComparatorEx<ByteArray> byteComparator) {
        this.comparator = byteComparator;
    }

    @Override
    public int compare(GTRecord a, GTRecord b) {
        assert a.getInfo() == b.getInfo();

        int comp;
        ImmutableBitSet allColumns = a.getInfo().getAllColumns();
        for (int i = 0; i < allColumns.trueBitCount(); i++) {
            int c = allColumns.trueBitAt(i);
            comp = comparator.compare(a.get(c), b.get(c));
            if (comp != 0)
                return comp;
        }
        return 0; // equals
    }
}
